The roadmap says roughly 10 hours but this is nowhere near accurate it is more around 30 hours i have spent about 3-4 hours just doing career for the last about 6 days and i've only just finished it and that was simulating a lot of games

This game is easy once you get the hang of the mechanics. Make sure to pay attention to the training. Once you're decent at the game, all you need to do is play 3 seasons of career maintaining a #1 spot for season 2/3 and then sim the last two. It takes maybe 6 hours to run through a career and beat it, then mop up the mp/exhibition achievements. This is also coming from someone who hadn't played an actual tennis game before, excluding wii sports and stuff like that